Automatic fluid-pressure and motor controller.



- 110450.412. E 'PATENTED APR.1'6,1907

' w. J. BELL.

'AUTQMATIG FLUID PRESSURE AND MOTOR CONTROLLER.

APPLIGATIOH FILED mm: a. 1905.

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WALTER J. BELL, OF LOS AN GELES, CALIFORNIA, ASSIGNOR OF ONE-HALF TOLEON F. MOSS, OF LOSANGELES, CALIFORNIA.

AUTOMATIC FLUID-"PRESSURE AND MOTOR CONTROLLER- N 0. 850,412.Specification of Letters Patent.

Application filed June 3, 1905. Serial No- 263,638.

Patented April 16, 1907.

To a, whom, it may concern:

Be it known that I, WALTER citizen of the United States,

geles, in the base by a pipe 3, connected with a motor-op- J. BELL, a 4erated pump or compressor. Where liquid residing at Los is employed tomove the piston, a returncounty of Los Angeles and I pipe 4 is provided,which pipe communicates State of California, have invented certain I atits upper end with the interior of the cylinnew and useful Improvementsin Automatic I der and is uncovered when the piston reachesFluid-Pressure and Motor Controllers; and I a predetermined height.- Thepiston is eledo hereby declare the following to be a full, I vatedagainst its own weight and a weight 5 and exact description of theinvention, I on a lever 6, pivoted in a bracket 7 on the cylinder.Interposed between the piston and lever is a ball 8, seated in a recessin the top of the piston-stem. The weight is shiftable along the leverto regulate the resistance offered to the pressure and is held in itsadjusted position by a set-screw or the like. In Fig. 4 is shown anotherform of lever 9, employed in connection with a resistance-spring l0,coiled around a rod 11, the latter being pivoted at its upper end to thelever and passing at its lower end loosely through an apertured lug 12,projecting from the lower end of the cylinder. .The spring is interposedbetween the lug and a tension-regulating nut 13. Supported from thecylinder, at the front thereof, is a plate 14, of insulating material,on which is secured a guide 15, slidably confining a bar 16. The bar isprovided with two bifurcated lugs, the upper one, 17, having pivotalconnection with one end of a rod 18, of insulating material, the otherend of the rod being pivoted to the lever 6 or 9. To the other lug 19 onthe bar 16 is pivoted a swinging contact 20, having oppositely-extending end projections 21 22 and an intermediate projection 23,serving, with the bar, to limit movement of the contact in onedirection. Pivoted on an arm 24, extending from the plate 14, is a shoe25 of T form, the top of the head being curved or beveled, as shown. Therise and fall movements of the shoe are limited by the engagements witha pin 26 on the arm 24 of the shoe and a finger I 27, carried by-theshoe. Pivoted at 28 on the plate 14 is a contact to which it appertainsto make and use the same.

In the actuation more particularly of railway appliances-for example,switches, sig nals, gates, and the like-by fluid-pressure a diminutionof pressure follows each application of power to move the switching orother element, requiring the frequent and in some instances the constantoperation of the pressure-creating means. It is desirable from thestandpoints of economy anddurability that l the operation of thepressure-creating means, in lieu of being constant, be coincident withthe reductions in pressure, and I have devised an applianceelectromechanical in character which operates automatically by varia- Itions in pressure to control the circuit of an electric motor formingapart of the pressurecreating means, whereby the pressure of the fluid,either air or liquid, is maintained practically constant and properactuation of the switching or other element is at all times assured.

The nature of the invention will be readily comprehended, referencebeing had to the following detailed description and to the accompanyingdrawings, illustrating the invention in its preferred form ofembodiment,it being understood that various modifications may be madetherein without exceeding the scope of the concluding claims.

In the drawings, Figure 1 is a top plan view of an automaticfluid-pressure and motor controlling appliance embodying the invention.Fig. 2 1s a front elevation of the same. 29 in the form of a bell-cranklever, one rela- Fig. 3 is a side elevation of the same. Fig. 4 tivelyshort arm 30 of which is engaged by is a detail view showing amodification. Fig. a flat spring 31 to normally press the longer 5 is asectional view on line 5 5 of Fig. 3. Figs. 6, 7, and 8 are detail viewsshowing cerarm 32 is in the path of the projection 22 of tain parts indiiferent positions. the swinging contact,'and said end is pro-Referring to the drawings by numerals, 1 vided on its inner side with adepending designates a vertical cylinder in which is slidplate 34,whereby the projection may hook ably arranged a piston 2, elevated byfluid under the arm and contact with the plate 34. under pressureentering the cylinder at its Wires 35 36 lead, respectively, from thearm 32 against a stop 33. The end of the

